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Related Concept Videos

Rolling With Slipping01:14

Rolling With Slipping

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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
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Types of Friction Problems01:27

Types of Friction Problems

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Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
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Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Rolling Without Slipping01:09

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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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Design Example: Designing Water Slide01:18

Design Example: Designing Water Slide

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When designing a water slide, controlling the speed of water flow is crucial for rider safety while maintaining an exciting experience. As water flows down the slide, gravity causes it to accelerate, with its speed at the bottom depending on the height from which it starts. The higher the slide, the more potential energy the water has at the top, which is converted into kinetic energy as it descends, increasing its speed.
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Static Friction01:18

Static Friction

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Static friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It plays a crucial role in our daily lives, from walking on the ground to driving a car.
For example, consider a scenario where a truck is connected to a car by a rope, ready to tow it along a road. When no external force is applied by the truck, the car remains stationary and is said to be in static equilibrium. In this case, the forces acting on the car, such as gravity and the...
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Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
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Drops Sliding on Non-SLIPS Structures.

Peixin Zhang1, Yanan Liu1, Chunyan Liao1

  • 1School of Physics, State Key Laboratory of Photon-Technology in Western China Energy, Northwest University, Xi'an 710127, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 16, 2021
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Summary

Researchers developed a novel non-SLIPS surface using nanostructures and a discontinuous lubricant film. This surface offers excellent self-cleaning and anti-contamination properties, even as the lubricant depletes, overcoming limitations of traditional SLIPS.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Slippery Liquid-Infused Porous Surfaces (SLIPS) mimic plant leaves for nonwetting and self-cleaning.
  • Practical applications of SLIPS are limited by the need for a continuous liquid layer and its inevitable loss.

Purpose of the Study:

  • To propose and characterize a novel non-SLIPS surface structure using solid nanostructures and a discontinuous lubricant film.
  • To investigate the self-cleaning and anti-contamination capabilities of this new surface model.

Main Methods:

  • Fabrication of non-SLIPS surfaces with tunable solid wettability using nanostructures.
  • Characterization of surface properties, including sliding angle and droplet velocity.
  • Formulation of the slippery mechanism based on energy barriers and molecular adsorption.

Main Results:

  • The non-SLIPS achieved excellent self-cleaning with a sliding angle comparable to traditional SLIPS.
  • Sliding velocity remained constant regardless of solid wettability, independent of lubricant layer thickness.
  • The energy barrier for sliding initiation correlated with molecular adsorption on nanostructures.

Conclusions:

  • The proposed non-SLIPS offers a robust alternative to traditional SLIPS, maintaining self-cleaning performance despite lubricant depletion.
  • This surface demonstrates effective anti-biological contamination properties.
  • The findings pave the way for more practical and durable self-cleaning surfaces.